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71.
Z. Horák 《Astrophysics and Space Science》1982,86(2):471-476
In 1979 I developed a special-relativistic analysis explaining the discrepancy of observed redshifts of spiral NGC 4319 and its companion quasar Markarian 205 by considering besides the Lorentz time dilatation also the gravitational redshift due to the gravitational field of Markarian 205 interpreted in terms of accretion of mass onto a black hole ejected from NGC 4319. In the present paper, a general-relativistic analysis is given. Numerical results of the special and general theories do not differ from each other significantly and admit the conclusion that the radius,r, of the radiating region of Markarian 205 is of the order of the tidal radius of black hole. Several models for various values of the ratio ofr to the Schwarzschild radius,r
s, are constructed. Models with 8.5r/r
s8.7 seem to be most realistic. It becomes clear that the interpretation of quasars in terms of huge black holes accreting stars can explain, in principle, the observed redshifts of quasars ejected from parent galaxies. 相似文献
72.
Aleš Farda Michel Déué Samuel Somot András Horányi Valery Spiridonov Helga Tóth 《Studia Geophysica et Geodaetica》2010,54(2):313-332
Results obtained with two versions of the Limited Area Model (LAM) ALADIN over differently sized integration domains (large,
intermediate and small) in the European area are presented in order to investigate both the general model performance and
the influence of domain choice on the quality of obtained results. The aim is also to illustrate the issues related to the
strategy of selection of the optimal integration domain. Each of these studies has been performed with two versions of the
ALADIN model: the first one is ALADIN-CLIMATE developed at CNRM/Météo-France, the second one is ALADIN-CLIMATE/CZ prepared
at the Czech Hydrometeorological Institute (CHMI). This leaves us with total of six experiments forced by the European Centre
for Medium-Range Weather Forecasts (ECMWF) ERA-40 reanalysis data. The west Balkan domain covering Bulgaria is used as an
evaluation region for investigation of the temporal and spatial properties of simulated precipitation and temperature fields.
This region has been selected for its challenging orography making the results obtained here a valuable source for studies
leading to further developments in climate modeling. It was found that size of the domain strongly affects the quality of
obtained results. We have found that the largest domain reproduces the spatial characteristics of climate (such as bias) very
well, but its use results in a poor representation of temporal aspects, which are however captured very well in experiments
over both smaller domains. Our findings suggest that there is no optimal choice of domain size, securing the best results
for both spatial and temporal evaluation. 相似文献
73.
Z. Horák 《Astrophysics and Space Science》1981,78(2):287-292
The question of the spatial homogeneity of the Universe is re-examined from the viewpoint of the hypothesis on the physical unity of the universe. It is shown that the demand for the universal validity of the theory of relativity implies that the average value of the Newtonian world potential is constant everywhere in the universe which is spatially homogeneous on a large scale. It turns out that Mach's principle is compatible with the special theory of relativity if the average value of the normalized world potential is exactly equal to–c
2. This fact may be interpreted as a consequence of the fundamental idea of the general relativity that cosmic matter determines the space-time metric in agreement with Mach's principle. 相似文献
74.
Camila Rodrigues Costa Cynthia Fernandes Pinto da Luz Ingrid Horák-Terra Plínio Barbosa de Camargo Uidemar Morais Barral Carlos Victor Mendonça-Filho Thamyres Sabrina Gonçalves Alexandre Christófaro Silva 《第四纪科学杂志》2023,38(1):61-75
The Cerrado biome is the second largest in Brazil, but the evolution of the Cerrado during the late Quaternary is not yet fully known. This study identifies paleoenvironmental changes during the last 23 000 years, based on a tropical mountain peatland record, in the Serra do Espinhaço Meridional in central-eastern Brazil. A multi-proxy approach was used that involved palynological analysis, stable isotopes (δ13C, δ15N), geochemistry, radiocarbon dating and multivariate statistics derived from a peatland core from Rio Preto (Minas Gerais state). The study reveals a very humid and cold climate during the late Pleistocene, with an increase in temperature and decrease in humidity at the Pleistocene–Holocene transition. During this period there was strong instability in the landscape (episodes of erosion). At the beginning of the Holocene there was a reduction in humidity with greater landscape stability. The current sub-humid climatic conditions seem to have been established in the mid-/late Holocene, with periods of landscape instability. Our findings agree with other Cerrado records that contradict previously established hypotheses, such as the Amazonian Refuge and the Pleistocene Arc. 相似文献